an unhandled exception occurred on the dispatcher thread

Hi (@YB_10448324 

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You should have a look here: https://community.ptc.com/t5/Mathcad-Installation/All-About-Mathcad-Software-Installation/m-p/706433#M26

and specifically this: Error "An Unhandled exception occurred on the dispatcher thread".   

And yes, instead of asking for more information, Catalina could have pointed this out too.

Success!
Luc